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# 11 Helpful Math Formulas for GMAT Quant

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Director
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Updated on: 14 Nov 2016, 12:03
Top Contributor
4

This is not meant to be an exhaustive list, just a helpful one. If I'm missing any formulas that you think are essential, then let me know and I'll add them below:

12) % change/increase/decrease = (difference)/(original) x 100

13) # of subsets of a set with n members: $$2^n$$

-Brian
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Harvard grad and 99% GMAT scorer, offering expert, private GMAT tutoring and coaching, both in-person (San Diego, CA, USA) and online worldwide, since 2002.

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Originally posted by mcelroytutoring on 17 Aug 2016, 11:14.
Last edited by mcelroytutoring on 14 Nov 2016, 12:03, edited 3 times in total.
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17 Aug 2016, 13:52
Number of ways of doing 3 things? Can you elaborate on that.
Director
Status: Professional GMAT Tutor
Affiliations: AB, cum laude, Harvard University (Class of '02)
Joined: 10 Jul 2015
Posts: 668
Location: United States (CA)
Age: 38
GMAT 1: 770 Q47 V48
GMAT 2: 730 Q44 V47
GMAT 3: 750 Q50 V42
GRE 1: Q168 V169
WE: Education (Education)

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Updated on: 20 Aug 2018, 11:20
Top Contributor
RaghavSingla wrote:
Number of ways of doing 3 things? Can you elaborate on that.

Sure! This is otherwise known as the "fundamental counting principle."

Let's say 4 = # of breakfast options, 5 = # of lunch options, and 6 = # of dinner options.

My total number of dining possibilities that day is 4 x 5 x 6 = 120.
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Harvard grad and 99% GMAT scorer, offering expert, private GMAT tutoring and coaching, both in-person (San Diego, CA, USA) and online worldwide, since 2002.

One of the only known humans to have taken the GMAT 5 times and scored in the 700s every time (700, 710, 730, 750, 770), including verified section scores of Q50 / V47, as well as personal bests of 8/8 IR (2 times), 6/6 AWA (4 times), 50/51Q and 48/51V (1 question wrong).

You can download my official test-taker score report (all scores within the last 5 years) directly from the Pearson Vue website: https://tinyurl.com/y94hlarr Date of Birth: 09 December 1979.

GMAT Action Plan and Free E-Book - McElroy Tutoring

Contact: mcelroy@post.harvard.edu

Originally posted by mcelroytutoring on 17 Aug 2016, 17:13.
Last edited by mcelroytutoring on 20 Aug 2018, 11:20, edited 1 time in total.
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18 Aug 2018, 14:00
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Re: 11 Helpful Math Formulas for GMAT Quant &nbs [#permalink] 18 Aug 2018, 14:00
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